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K. Ohnishi; T. Yamamoto; A. Takahashi; H. Tanaka, M. Koyama, M. Masukawa, T. Ohnishi (2000). Unique postural control of upside-down swimming catfish, Synodontis nigriventris, not affected by the change of gravity. J Gravit Physiol. 7 (2): 97—108. PMID12697555.